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Investigation of kinetics and morphology development
for polyurethane-urea extended by DMTDA |
| LI Zai-feng1, LI Jin-yan1, SUN Jian1, SUN Bao-qun2, WANG Jin-jing2, SHEN Qiang2 |
| 1.Key Laboratory of Eco-chemical Engineering, Ministry of Education; College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology; 2.Shengli Oil Production Research Institute, SINOPEC |
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Abstract The relationship between the reactions kinetics and morphology development during the polyurethane-urea (PUU) curing process has been investigated simultaneously by in situ Fourier transform infrared spectroscopy (FTIR). The data of the FTIR spectra showed that with the increase of conversion, the absorbance of NH bands increases and its band sites shifts to lower wavenumbers; the absorbance of free urethane carbonyl kept nearly constant at low conversion, and then decreased much because of the interaction of the formed urea links, and then changed little at high conversion owing to the diffuse control. The band sites of hydrogen bonded urea carbonyl similarly shifted to lower wavenumbers and the absorbance of the hydrogen bonded urea carbonyl, associated with the phase separation of hard segments, became stronger with buildup of hydrogen bond between urea links. The carbonyl bands available during curing process were further assigned. Both interactions, such as hydrogenised effect and phase separation, played a major role in the matrix formation of the PUU polymer.
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Issue Date: 05 June 2008
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